Negative pressure device
A technology of negative pressure and negative pressure zone, which is applied in the field of negative pressure devices, can solve the problems of complex pressure regulating valves and high disposal costs of pressure regulators, and achieve the effect of prolonging the quiet period
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example 1
[0196] Example 1 Preparation of a vacuum valve by partially sealing a continuous pipe
[0197] Thermoplastic elastomer (TPE) tubing (Cole-Parmer, Clear C-Flex Tubing, pcs. No. WZ-06422-15) is heat-sealed in the direction perpendicular to its long axis in the manner shown in Figure 14, as shown in Figure 15 at a temperature of 98-100°C for a welding time of 3.0 seconds at 3 Bars Under pressure (300 kPa), cool to 80 °C before releasing the sample in the sealant jaws.
[0198] The result is a partially deformed tube that is deformed at the sides (areas receiving the greatest pressure) but remains unsealed across its center as shown in FIGS. 16 , 17 and 18 .
[0199] Trim the pipe at a distance of 40 mm from the welding point in a direction perpendicular to the long axis of the pipe.
example 2
[0200] Example 2 Performance of a vacuum valve obtained by partially sealing a continuous pipeline
[0201] The valve prepared in Example 1 was mounted to a vacuum source, and a vacuum gauge was placed between the vacuum source and the valve and on the side of the valve away from the vacuum source. Valve operation was demonstrated by turning on the vacuum source to generate a vacuum of 202 mmHg proximal to the valve and 557 mmHg distal to the valve. The ambient pressure is 756 mmHg, so the valve is closed at a vacuum of 200 mmHg below ambient atmospheric pressure.
example 3
[0202] Example 3 Vacuum Regulating Valve Prepared by Heat-Sealing Thermoplastic Elastic Tube
[0203] Clear thermoplastic elastomer tubing (Clear C-flex tubing, 3 / 8" inner diameter (9 mm), 1 / 2" (12 mm) outer diameter, Cole-Parmer Instrument Co., Ltd.) was cut into 100 mm lengths at right angles to It is heat-sealed at its midpoint in the direction of its longest axis. The heat sealer used was a Hulme Martin HM1000P portable heat sealer with a 3 mm belt running on heat set 10 and cool set 10 at 315 W per seal. Only one jaw of the heat sealer is heated, thus rotating the tube half a turn along its long axis, and the procedure is repeated. Repeat this process 3 times in each direction. The same process was then repeated 2 times in each direction on two adjacent sides of the central 3 mm wide strip to form a heat-sealed section approximately 10 mm wide. This process does not seal the tube, but creates corrugated inner folds that allow the tube to seal completely across its wi...
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